Compilare: main.c: In function 'main': main.c:7:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("soldati.in","r",stdin),freopen("soldati.out","w",stdout),scanf("%d\n",&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:7:37: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("soldati.in","r",stdin),freopen("soldati.out","w",stdout),scanf("%d\n",&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:7:71: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("soldati.in","r",stdin),freopen("soldati.out","w",stdout),scanf("%d\n",&m); ^~~~~~~~~~~~~~~~ main.c:9:9: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(s,100005,stdin),v[0]=l=k=0,n=strlen(s)-1; ^~~~~~~~~~~~~~~~~~~~~ In file included from /usr/include/stdio.h:936:0, from main.c:1: In function 'fgets', inlined from 'main' at main.c:9:9: /usr/include/x86_64-linux-gnu/bits/stdio2.h:261:9: warning: call to '__fgets_chk_warn' declared with attribute warning: fgets called with bigger size than length of destination buffer return __fgets_chk_warn (__s, __bos (__s), __n, __stream); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~